h型支擋結(jié)構(gòu)性狀分析
[Abstract]:H-type retaining structure, as a new type retaining structure, is more and more widely used in engineering practice. In this paper, a side slope project in Ningde City, Fujian Province is taken as the research object, the h-shaped retaining structure is numerically simulated by using PLAXIS finite element software, the Hardening-soil constitutive model is used to reflect the loading and unloading properties of the soil, and the pile-soil action is simulated by the contact surface element. In this paper, the basic calculation model is established to analyze the working character of h-type retaining structure, and to study the character change and potential damage pattern under various factors and different calculation parameters. Firstly, the PLAXIS software and the finite element calculation method are introduced, and the basic characteristics of the finite element related material element are analyzed. According to the comparison of the advantages and disadvantages of different constitutive models, it is decided to adopt the hardened soil constitutive model and expand the related model to introduce the basic characteristics of the finite element related material element. The principle of strength reduction method is described in detail. In order to reveal the working mechanism of h-type retaining structure, the numerical models of double-row single-pile and gantry retaining structure are established, respectively, in order to reveal the working mechanism of the h-shaped retaining structure, and establish the numerical model of the double-row single-pile and gantry retaining structure, respectively. Compared with the stress and deformation performance of h-type retaining structure, the characteristics of h-type retaining structure are further summarized. Thirdly, the behavior analysis of h-shaped retaining structure under the influence factors is carried out, and the pile diameter, pile row distance, embedded depth, stiffness of connecting beam, angle of connecting beam, hinge system and cohesive force are established, respectively. Different parameter models of internal friction angle and compression modulus. According to the analysis results, the optimum pile diameter, pile row distance, connecting beam size and embedded depth are put forward, which provide a reference for optimizing the design of h-type retaining structure. Then, the failure mechanism of h-shaped retaining structure is analyzed by Phi-c program. The pile diameter, pile row distance, embedded depth, stiffness of connecting beam, inclination angle of connecting beam, hinge system and shear strength are studied. The potential failure mode of slope is analyzed by the possible slip surface of different calculation parameters, such as compression modulus and so on. At the same time, the relationship between the calculation parameters of each factor and the stability of slope is analyzed. Then, the finite element numerical model is reasonably generalized based on the analysis of engineering examples and the understanding of the characteristics of geotechnical strata and surrounding environment in the field area. The actual retaining effect of h-type retaining structure is verified by the monitoring results, and the rationality of the finite element model and parameters is verified by comparing with the finite element simulation results. At last, the main contents and achievements of this paper are summarized. At the same time, some suggestions for further research are put forward.
【學(xué)位授予單位】:福州大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2013
【分類號(hào)】:TU470
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